US7952546B2 - Sample/hold circuit, electronic system, and control method utilizing the same - Google Patents
Sample/hold circuit, electronic system, and control method utilizing the same Download PDFInfo
- Publication number
- US7952546B2 US7952546B2 US11/768,942 US76894207A US7952546B2 US 7952546 B2 US7952546 B2 US 7952546B2 US 76894207 A US76894207 A US 76894207A US 7952546 B2 US7952546 B2 US 7952546B2
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- United States
- Prior art keywords
- transistor
- sampling
- coupled
- liquid crystal
- capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3618—Control of matrices with row and column drivers with automatic refresh of the display panel using sense/write circuits
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
Definitions
- the invention relates to a sample/hold circuit, and more particularly to a sample/hold circuit appropriate for a pixel unit comprising a liquid crystal capacitor.
- CTRs cathode ray tubes
- LCD liquid crystal displays
- PDP plasma display panels
- OLED organic electroluminescent displays
- FED field emission displays
- LCDs Liquid crystal displays
- DSCs digital still cameras
- NBs notebook computers
- PCs personal computers
- PDAs personal digital assistants
- LCD driving methods include static driving, simple matrix driving, and active matrix driving.
- Simple matrix driving also known as passive matrix
- TN twisted nematic
- STN super twisted nematic
- TFT Thin film transistors
- the invention provides sample/hold circuits.
- An exemplary embodiment of a sample/hold circuit is appropriate for a pixel unit comprising a liquid crystal capacitor and comprises a sampling transistor, a sampling capacitor, a first switching transistor, and a second switching transistor.
- the sampling transistor is coupled to the liquid crystal capacitor for sampling a voltage stored in the liquid crystal capacitor.
- the sampling capacitor stores the sampling result.
- the first switching transistor comprises a gate and a source respectively coupled to two terminals of the sampling capacitor.
- the second switching transistor comprises a gate and a drain respectively coupled to the terminals of the sampling capacitor.
- An exemplary embodiment of an electronic system comprises a plurality of pixel modules.
- Each pixel module comprises a pixel unit and a sample/hold circuit.
- the pixel unit is coupled to a gate electrode and a data electrode, and comprises a driving transistor and a liquid crystal capacitor.
- the driving transistor is turned on according to a scan signal provided by the gate electrode.
- the liquid crystal capacitor stores a data signal provided by the data electrode when the driving transistor is turned on.
- the sample/hold circuit comprises a sampling transistor, a sampling capacitor, a first switching transistor, and a second switching transistor.
- the sampling transistor is coupled to the liquid crystal capacitor for sampling a voltage stored in the liquid crystal capacitor.
- the sampling capacitor stores the sampling result.
- the first switching transistor comprises a gate and a source respectively coupled to two terminals of the sampling capacitor.
- the second switching transistor comprises a gate and a drain respectively coupled to the terminals of the sampling capacitor.
- a control method for the above electronic system is provided.
- An exemplary embodiment of a control method is described in the following.
- the data signal is stored in the liquid crystal capacitor via the driving transistor.
- a voltage stored in the liquid crystal capacitor is sampled.
- the data signal is stored in the liquid crystal capacitor via the first and the second switching transistors according to the sampling result.
- FIG. 1 is a schematic diagram of an exemplary embodiment of an electronic system
- FIG. 2 is a schematic diagram of an exemplary embodiment of the display unit
- FIG. 3 is a schematic diagram of an exemplary embodiment of the pixel module.
- FIG. 4 is a flowchart of a control method.
- FIG. 1 is a schematic diagram of an exemplary embodiment of an electronic system.
- Electronic system 100 comprises a power unit 110 and a display unit 120 .
- Power unit 110 provides a power signal S PW .
- Display unit 120 receives the power signal S PW and can display an image.
- the electronic system 100 can be a personal digital assistant (PDA), a notebook computer (NB), a personal computer (PC), digital camera, car TV or a mobile telephone.
- PDA personal digital assistant
- NB notebook computer
- PC personal computer
- digital camera car TV or a mobile telephone.
- FIG. 2 is a schematic diagram of an exemplary embodiment of the display unit.
- Display unit 120 can be an LCD and comprises a gate driver 210 , a source driver 220 , a controller 230 , and pixel modules P 11 ⁇ P mn .
- Gate driver 210 provides scan signals via gate electrode G 1 ⁇ G n .
- Source driver 220 provides data signals via data electrode D 1 ⁇ D m .
- Pixel modules P 11 ⁇ P mn receive the data signals according to the scan signals.
- a frame inversion can be utilized for providing polarity to pixel modules P 11 ⁇ P mn .
- the operation voltages of gate driver 210 , source driver 220 , controller 230 , and pixel modules P 11 ⁇ P mn are based on the power signal S PW .
- FIG. 3 is a schematic diagram of an exemplary embodiment of the pixel module.
- Pixel module P 11 comprises a pixel unit 310 and a sample/hold circuit 320 .
- the pixel unit 310 is coupled to the gate electrode G 1 and the data electrode D 1 and can comprise a driving transistor 311 , a storage capacitor 312 , and a liquid crystal capacitor 313 .
- driving transistor 311 is turned on according to the scan signal provided by the gate electrode G 1
- storage capacitor 312 and liquid crystal capacitor 313 store the corresponding voltages according to the data signal provided by the data electrode D 1 .
- Sample/hold circuit 320 can comprise a sampling transistor 321 , a sampling capacitor 322 , switching transistors 323 and 324 .
- Sampling transistor 321 is coupled to liquid crystal capacitor 313 for sampling the voltage stored in liquid crystal capacitor 313 .
- Sampling capacitor 322 stores the sampling result.
- Switching transistor 323 comprises a gate and a source respectively coupled to two terminals of sampling capacitor 322 .
- Switching transistor 324 comprises a gate and a drain respectively coupled to the terminals of sampling capacitor 322 .
- sampling transistor 321 samples the voltage stored in liquid crystal capacitor 313 and then stores the sampling result in sampling capacitor 322 .
- the voltage stored in sampling capacitor 322 is equal to the voltage stored in liquid crystal capacitor 313 .
- the voltage stored in sampling capacitor 322 is 5V.
- switching transistors 323 and 324 are turned on to provide the data signal provided by data electrode D 1 to liquid crystal capacitor 313 . Because the data signal provided by data electrode D 1 is transmitted to liquid crystal capacitor 313 via another path, the voltage stored in liquid crystal capacitor 313 is further stabilized.
- pixel module P 11 can further comprise a reference transistor 325 and a separation transistor 326 .
- Reference transistor 325 is coupled between data electrode D 1 and switching transistor 323 .
- reference signal S R provided by controller 230 is high, reference transistor 325 is turned on for providing a level to sampling capacitor 322 .
- reference transistor 325 comprises a drain coupled to data electrode D 1 , and a source coupled to a drain of switching transistor 323 .
- Separation transistor 326 is coupled between switching transistor 324 and liquid crystal capacitor 313 .
- separation signal S S provided by controller 230 is at a low level, separation transistor 326 is turned off, thus, sampling transistor 321 only samples the voltage stored in liquid crystal capacitor 313 .
- Separation transistor 326 comprises a drain coupled to a source of switching transistor 324 and a source coupled to liquid crystal capacitor 313 and a drain of sampling transistor 321 .
- reference transistor 325 and separation transistor 326 When switching transistors 323 and 324 , reference transistor 325 , and separation transistor 326 are turned on, the data signal provided by data electrode D 1 is transmitted to liquid crystal capacitor 313 through reference transistor 325 , switching transistors 323 and 324 , and separation transistor 326 .
- reference transistor 325 and separation transistor 326 can be omitted or a compensation capacitor can be added to pixel module P 11 .
- a compensation capacitor 327 can be coupled between a gate of switching transistor 323 and a gate of sampling transistor 321 for eliminating noise.
- FIG. 4 is a flowchart of a control method.
- the control method is appropriate for the pixel module shown in FIG. 3 .
- the data signal is stored in the liquid crystal capacitor via the driving transistor (step S 410 ).
- driving transistor 311 is turned on.
- the data signal provided by data electrode D 1 is stored in storage capacitor 312 and liquid crystal capacitor 313 via driving transistor 311 .
- sampling transistor 321 is turned on for sampling the voltage stored in liquid crystal capacitor 313 .
- reference transistor 325 is turned on and separation transistor 326 is turned off. After sampling, separation transistor 326 is switched from off to on.
- the data signal is stored in the liquid crystal capacitor via the first and second switching transistors according to the sampling result (step S 430 ).
- Sampling capacitor 322 stores the sampling result.
- Switching transistors 323 and 324 transmit the data signal provided by data electrode D 1 to liquid crystal capacitor 313 according to the voltage stored in sampling capacitor 322 .
- the voltage stored in liquid crystal capacitor 313 is stabilized.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims (18)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/768,942 US7952546B2 (en) | 2007-06-27 | 2007-06-27 | Sample/hold circuit, electronic system, and control method utilizing the same |
TW097121689A TWI380282B (en) | 2007-06-27 | 2008-06-11 | Sample/hold circuit, electronic system, and control method utilizing the same |
JP2008156388A JP5452891B2 (en) | 2007-06-27 | 2008-06-16 | Sample hold circuit, electronic system, and control method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/768,942 US7952546B2 (en) | 2007-06-27 | 2007-06-27 | Sample/hold circuit, electronic system, and control method utilizing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090002582A1 US20090002582A1 (en) | 2009-01-01 |
US7952546B2 true US7952546B2 (en) | 2011-05-31 |
Family
ID=40159947
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/768,942 Active 2029-09-03 US7952546B2 (en) | 2007-06-27 | 2007-06-27 | Sample/hold circuit, electronic system, and control method utilizing the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US7952546B2 (en) |
JP (1) | JP5452891B2 (en) |
TW (1) | TWI380282B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100085286A1 (en) * | 2008-10-07 | 2010-04-08 | Tpo Displays Corp. | Active matrix type display device and portable machine comprising the same |
US20120127215A1 (en) * | 2010-10-25 | 2012-05-24 | Chimei Innolux Corporation | Display device and electronic device using the same |
US20130021320A1 (en) * | 2011-07-18 | 2013-01-24 | Chimei Innolux Corporation | Pixel element, display panel thereof, and control method thereof |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI421852B (en) * | 2011-06-13 | 2014-01-01 | Univ Nat Chiao Tung | The analog memory cell circuit for the ltps tft-lcd |
RU2488174C1 (en) * | 2009-09-07 | 2013-07-20 | Шарп Кабусики Кайся | Pixel circuit and display unit |
CN102498510B (en) * | 2009-09-07 | 2014-10-08 | 夏普株式会社 | Pixel circuit and display device |
JP5346381B2 (en) * | 2009-09-07 | 2013-11-20 | シャープ株式会社 | Pixel circuit and display device |
US9159283B2 (en) * | 2011-07-18 | 2015-10-13 | Innolux Corporation | Switch circuit, pixel element and display panel for using in refreshing memory in pixel |
US8896512B2 (en) | 2011-08-04 | 2014-11-25 | Sharp Kabushiki Kaisha | Display device for active storage pixel inversion and method of driving the same |
US9208714B2 (en) * | 2011-08-04 | 2015-12-08 | Innolux Corporation | Display panel for refreshing image data and operating method thereof |
US8836680B2 (en) | 2011-08-04 | 2014-09-16 | Sharp Kabushiki Kaisha | Display device for active storage pixel inversion and method of driving the same |
US10290272B2 (en) * | 2017-08-28 | 2019-05-14 | Innolux Corporation | Display device capable of reducing flickers |
Citations (4)
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---|---|---|---|---|
US6703995B2 (en) * | 2000-10-05 | 2004-03-09 | Koninklijke Philips Electronics N.V. | Bistable chiral nematic liquid crystal display and method of driving the same |
WO2004090854A1 (en) | 2003-04-09 | 2004-10-21 | Koninklijke Philips Electronics N.V. | Active matrix array device, electronic device and operating method for an active matrix array device |
US20060181495A1 (en) * | 2003-07-15 | 2006-08-17 | Edward Martin J | Active matrix array device |
US20060232577A1 (en) * | 2003-08-08 | 2006-10-19 | Edwards Martin J | Circuit for signal amplification and use of the same in active matrix devices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3102666B2 (en) * | 1993-06-28 | 2000-10-23 | シャープ株式会社 | Image display device |
JP4552069B2 (en) * | 2001-01-04 | 2010-09-29 | 株式会社日立製作所 | Image display device and driving method thereof |
JP2002297100A (en) * | 2001-03-29 | 2002-10-09 | Mitsubishi Electric Corp | Liquid crystal display device, and portable telephone and portable information terminal equipment provided therewith |
JP2002366116A (en) * | 2001-06-07 | 2002-12-20 | Mitsubishi Electric Corp | Liquid crystal display device, and portable telephone set and portable information terminal equipment equipped with the same |
GB0117226D0 (en) * | 2001-07-14 | 2001-09-05 | Koninkl Philips Electronics Nv | Active matrix display devices |
-
2007
- 2007-06-27 US US11/768,942 patent/US7952546B2/en active Active
-
2008
- 2008-06-11 TW TW097121689A patent/TWI380282B/en not_active IP Right Cessation
- 2008-06-16 JP JP2008156388A patent/JP5452891B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US6703995B2 (en) * | 2000-10-05 | 2004-03-09 | Koninklijke Philips Electronics N.V. | Bistable chiral nematic liquid crystal display and method of driving the same |
WO2004090854A1 (en) | 2003-04-09 | 2004-10-21 | Koninklijke Philips Electronics N.V. | Active matrix array device, electronic device and operating method for an active matrix array device |
US20060181495A1 (en) * | 2003-07-15 | 2006-08-17 | Edward Martin J | Active matrix array device |
US20060232577A1 (en) * | 2003-08-08 | 2006-10-19 | Edwards Martin J | Circuit for signal amplification and use of the same in active matrix devices |
Non-Patent Citations (1)
Title |
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"Late News Paper: Dynamic Self-Refreshing Memory-in-Pixel Circuit for Low Power Standby Mode in Mobile LTPS TFT-LCD" K. Yamashita et al., 2004, pp. 1096-1099. |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100085286A1 (en) * | 2008-10-07 | 2010-04-08 | Tpo Displays Corp. | Active matrix type display device and portable machine comprising the same |
US8508516B2 (en) * | 2008-10-07 | 2013-08-13 | Chimei Innolux Corporation | Active matrix type display device and portable machine comprising the same |
US20120127215A1 (en) * | 2010-10-25 | 2012-05-24 | Chimei Innolux Corporation | Display device and electronic device using the same |
US8736591B2 (en) * | 2010-10-25 | 2014-05-27 | Chimei Innolux Corporation | Display device using pixel memory circuit to reduce flicker with reduced power consumption |
US20130021320A1 (en) * | 2011-07-18 | 2013-01-24 | Chimei Innolux Corporation | Pixel element, display panel thereof, and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
TW200901158A (en) | 2009-01-01 |
JP5452891B2 (en) | 2014-03-26 |
TWI380282B (en) | 2012-12-21 |
US20090002582A1 (en) | 2009-01-01 |
JP2009009128A (en) | 2009-01-15 |
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